-=> Quoting Robert Sayre to Matt Mc_carthy <=-

 >>> anything connected to the centre tap?
 >>> (a transformer like that is typically used for a push-pull
 >>> rectifier) (especially if you want about 14V out of it rather than
 >>> about 30V )
 
 >> THANK you!  I couldn't think of the name last night, and only
 >> "doubler" came mind, which would be dumb in a charger
type circuit!

 > I've only heard that called a full wave rectifier
 > circuit, but not a push-pull. I've only heard of
 > push-pull in regards to amplifiers. Learn something
 > new every day.

 In over 50 years working in and teaching radio/TV/electronics, I
 have NEVER heard of a full-wave rectifier using a center-tapped
 transformer called "push-pull".

 Yes!  Amplifiers use the same principle, but there is a great
 difference between power supplies and power amps.

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